From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9572635AC01 for ; Wed, 11 Mar 2026 08:26:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773217582; cv=none; b=dbxpzQ8g55OunGrpbD5czaSyDO7V/jnaJcdoSBl6Ynw3YWJwVmoZ4/XSsdTnKOzaPyzLp22iQktKCOyyTklZZ0OIawwwI6kGWNC9tVP/wCTEqXucwaNoPN+ze0NRsZgAvj/X9C+KBER1kbP3ilxkzE7juYjjhoA8YfdcYY/M/8w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773217582; c=relaxed/simple; bh=6cBlhOKJedbx2qsxUWwykXn46F7QgKz0H5LTP9zsQ7w=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=MYLCrTsDcIT31yNadOf8GYygRQQ6TD3k0I91T9/VyGwb2Js87k66nlT1tlqAeY+fCfCe5vqtFqiCtQKE79t9YsbNtmZAS+BqLgqTDD+XlQiZAxtxlxX8mCSln1d+Z9k00/wDWGFC7A+moFPOSWGh2TD7MGydx95yGNAoe2JodmM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Jouh6own; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Jouh6own" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 36483C4CEF7; Wed, 11 Mar 2026 08:26:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773217582; bh=6cBlhOKJedbx2qsxUWwykXn46F7QgKz0H5LTP9zsQ7w=; h=From:Subject:Date:To:Cc:From; b=Jouh6ownmsDl4uHhgu00E696xSDlRCFSswWYm3haODHphQ3DtOBX6PWXg+4yfs94t r92hBR470/avu+bXQ2oood6mK9eTGsZd0ev+NBeBTcV8WDqLwtMhDRw/cGxSBDKqsR zFbAXlBoWWigp0ggdKhKCVW+CuVU3Ja4+IAaE3PqqWEdOZtHqNqhtgRsEcpHTVQ6El /vpmiZ4LxOxUhHok2LqtRbB74PQpXbT4A0XmOo1qasQ2sGHxlJRbMl/Psf3IWR39Vx lSXJ6JOtK6kOqqG27DM/OMUILUteMJim8mPMjFgn4deLMtyN9UpLrGdQMNqqhhTevl KIskA17y0tZ1g== From: "Vlastimil Babka (SUSE)" Subject: [PATCH 0/3] slab: support memoryless nodes with sheaves Date: Wed, 11 Mar 2026 09:25:54 +0100 Message-Id: <20260311-b4-slab-memoryless-barns-v1-0-70ab850be4ce@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIABInsWkC/x3MTQqEMAxA4atI1hNo6x94FZlFqlEDWiWBYUS8u 8Xlt3jvAmMVNuiKC5R/YrKnDP8pYFgozYwyZkNwoXGl9xgrtJUibrzteq5shpE0GU40NpVvQyR XQ84P5Un+77r/3vcDrxYx2WoAAAA= X-Change-ID: 20260311-b4-slab-memoryless-barns-fad64172ba05 To: Ming Lei , Harry Yoo Cc: Hao Li , Andrew Morton , Christoph Lameter , David Rientjes , Roman Gushchin , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Vlastimil Babka (SUSE)" X-Mailer: b4 0.14.3 This is the draft patch from [1] turned into a proper series with incremental changes. It's based on v7.0-rc3. It's too intrusive for a 7.0 hotfix, so we'll only be able to fix/reduce the regression in 7.1. I hope it's acceptable given it's a non-standard configuration, 7.0 is not a LTS, and it's a perf regression, not functionality. Ming can you please retest this on top of v7.0-rc3, which already has fb1091febd66 ("mm/slab: allow sheaf refill if blocking is not allowed"). Separate data point for v7.0-rc3 could be also useful. [1] https://lore.kernel.org/all/c6a01f7e-c6eb-454b-9b9e-734526dd659d@kernel.org/ Signed-off-by: Vlastimil Babka (SUSE) --- Vlastimil Babka (SUSE) (3): slab: decouple pointer to barn from kmem_cache_node slab: create barns for online memoryless nodes slab: free remote objects to sheaves on memoryless nodes mm/slab.h | 7 +- mm/slub.c | 256 +++++++++++++++++++++++++++++++++++++++++++++----------------- 2 files changed, 191 insertions(+), 72 deletions(-) --- base-commit: 1f318b96cc84d7c2ab792fcc0bfd42a7ca890681 change-id: 20260311-b4-slab-memoryless-barns-fad64172ba05 Best regards, -- Vlastimil Babka (SUSE)